Terrorists aren’t the only people who threaten city subways, said Sen. Charles Schumer.

Beware of cheapskates in Washington, too.

“The fact remains that New York doesn’t have the resources available to do what it needs to bring our mass-transit system up to snuff security-wise,” Schumer said yesterday. “It’s time that the feds deliver to New York.”

Schumer said the New York region’s share of federal mass-transit funding is nearly half of what it was two years ago, down to 26 percent of the federal pot from 46 percent – and that’s although the Metropolitan Transportation Authority carries about a third of the nation’s transit riders.

In a letter to Homeland Security Secretary Michael Chertoff, Schumer called for an increase when allocations are announced over the next few months. He said the recent threat of a terrorist strike on the city’s subways is a wake-up call for increased federal funding.

“I do not think it makes sense that the transit system under the greatest threat should lose out year after year,” Schumer said in the letter.

Although transit has become the terrorist target of choice, as evidenced by the recent London subway bombings, security funding for mass transit doesn’t come close to what is spent to keep airplane passengers safe, the senator said.

For every $7 spent on an airline passenger’s safety, little more than a penny is spent for someone who rides the No. 6 train to work, Schumer said.